Wheeled scraper



Jan. 19, 1943. T. R. PAULSEN 2,308,534

WHEELED S CRAPER Filed Aug. 26, 1940 INVENTOR.

ATTORNEYS Patented Jan. 19, 1943 WHEELED SCRAPER Thomas R. Paulsen, South Milwaukee, Wis., asslgnor to Bucyrus-Erie Company, South Milwaukee, Wis., a corporation of Delaware Application August 26, 1940, Serial No. 354,150

7 Claims.

My invention relates to new and useful improvements-in wheeled scrapers, and more particularly to that type of such scrapers, in which the bowl fills at its front end and dumps at its rear end.

In devices of this sort, the bowl is pivoted, adjacent its rear lower corners, to the carrying frame. A single hydraulic cylinder, or a pair of cylinders, mounted on the frame, serves to rotate the bowl about its pivot, in either direction from its neutral (1. e., carrying) position.

Each end of the bowl is provided with a closure, the front closure being known as the apron, and the rear closure being known as the end gate.

When the bowl tips downward into its digging position, the apron opens. When the bowl tips upward into its dumping position, the end gate opens.

But, although these functions have been attained in the prior art with a fair degree of satisfaction, I have found it desirable to effect the following improvements.

In scrapers of this general type, it is necessary to have the rear end of the bowl be a considerable distance above the ground, in order to provide clearance for traveling. As a result, when the front of the bowl (where the cutting edge is located) is lowered to the ground for digging, there is a considerable slope to the bottom of the bowl, and this slope renders filling diflicult.

Accordingly it is the principal object of my invention to provide means whereby the pivot at the rear of the bowl will be lower when the bowl is in digging position than when the bowl is in carrying position. To this end, my wheels instead of being mounted directly on the frame are mounted on levers which are controlled by cams attached to the bowl. These cams are so arranged that when the bowl is dropped fromthe carrying to the digging position, the whole frame of the scraper is allowed to drop, thus lowering the rear end of the bowl.

In addition to my principal objects, above stated, I have worked out a number of novel and useful details, which will be readily evident as the description progresses.

My invention consists in the novel parts and in the combination and arrangement thereof, which are defined in the appended claims, and of which one embodiment is exemplified in the accompanying drawing, which is hereinafter particularly described and explained.

Throughout the description, the same refer ence number is applied to the same member or to similar members.

Figures 1, 2, and 3 are side elevations of one form of my scraper, in digging, carrying, and dumping positions respectively.

Figure 4 is a nearly horizontal section, taken along the lines 4-4 of Figure 2.

Referring more particularly to Figures 1, 2 and 3, we see that H is the nearer one of a pair of side beams. It is shown broken off at the front. Actually it is joined to its fellow by a cross beam (not shown), from which a tongue (not shown) extends forward to a draft connection (not shown) with the tractor (not shown) which pulls my scraper.

For further details, here or elsewhere throughout my description, see my earlier Patent Re. 21,170, for wheeled scraper, issued August 1, 1939, of which scraper my present invention is an improvement.

Wheels it support my side-beams II in a manner to be later described.

My bowl I5 is pivoted at l6to the side beams II. The bowl has'a digging edge I1.

Hydraulic cylinders iii are mounted in an elevated position on the main frame, well forward and out of the way of the digging elements. The cylinders rotate the bowl l5 about its pivot I6, by means of piston rods i9, rocker-arms 20 and connecting-rods 2|. The cylinders are fed from a source (not shown) on the tractor, by means of piping (not shown), and may be controlled, preferably from the driver's seat (not shown) in any convenient conventional manner (not shown).

Considering, the carrying position of Figure 2 as neutral, it will be seen that a retraction of piston-rod l9 will lower the bowl l5 to the digging position shown in Figure l, and that a thrusting out of this piston-rod will raise the bowl to the dumping position shown in Figure 3.

The apron 22 is pivotally supported by the upper ends of bent rods 23, the lower ends of said rods being pivotally supported by the frame at IS, the same point of support as that which supports the bowl. The elbow of each bent rod rests upon a stop 24 on the side beam ll.

Bars 25, pivoted at one end to the bowl and at the other end to the apron, serve (see Figure 1) to rotate the apron 22 upwardly about its pivotal support on the bent-rod 23, when the bowl l5 descends to its digging position; and (see Figurel;,3 to maintain the apron closed, when the bowl-is lifted to its dump n p sition.

An end'gate .26, pivoted to the bowl at 21, is

directly connected to the frame by chain 28. When (see Figure 3) the bowl is lifted to its dumping position, the chain tautens, thus 'ppening the end gate to permit the contents of the bowl and apron to escape rearwardly.

In Figures 1 and 2, the middle portion of chain 28 is omitted, to avoid obscuring other parts of the mechanism.

We now come to the features wherein my present scraper difiers from the scraper of my earlier patent. See more particularly Figure 4 hereof. My wheels l4, instead of being directly mounted on the side beams II as in'my earlier device, are each joumaled on an axle 30, carried at the end of one arm of a bell-crank 31, the elbow of which in turn is journaled at 32 on the side beams II. The other arm of the bellcrank carries a roller 33, which travels along the forward and upper edge of a cam 34, which cam is secured to the side of the bowl l5, preferably by brackets 35, 36.

The forward edge of the cam 34 is concentric with the pivot I6 of. the bowl I5, so that, in dumping (Figure 3) and carrying (Figure 2) positions, the wheels. l4 are depressed with respect to the side beams H; i. e., the whole scraper is held in a raised position.

But, due to the fact that the upper portion of the edge of cam 34 approachespivot l6.

the wheels I4 are raised with respect to the side beams II in digging position (Figure 1);

i. e., the whole scraper is lowered, and thusthe inclination of the bottom of the bowl l is-less' than it would he, were it not for this cam feature;

Having now described and illustrated one form of my invention, I wish it to be understood that my invention is not to be limited to the specific form or arrangement of parts hereinbefore described, except as specifically limited in the appended claims.

I claim:

I. In a scraper, the combination of: a groundsupported'frame; a dirt-digging bowl,-open at both ends, pivoted rearwardly on the frame, and having a digging edge at its front end; ground supports for the frame; means to rotate the bowl about its pivot, from carrying position, in one direction to dig and in the other direction to dump; and means controlled by the angular position of the bowl, whereby the pivot of the bowl will be lower in digging position than in carrying and dumping positions; said last named means consisting in a cam carried by the bowl, a lever connecting the ground supports to the frame, and means carried by the lever and bearing on the cam surface of the cam.

2. In a scraper, the combination of: a groundsupported frame; a dirt-digging bowl, open at both ends, pivoted rearwardly on the frame, and having a digging edge at its front end; ground supports for the frame; means to rotate the bowl about its pivot, from carrying position, in one direction to dig and in the other direction to dump; and means controlled by the angular position of the bowl, whereby thepivot of the bowl will be lower in digging position than in carrying and dumping positions; said last named means consisting in a variably positionable rigid support for the frame supported by the ground supports, and means carried by the bowl to regulate the height of said variable support.

3. In a scraper, the combination of: a groundsupported frame; a dirt-digging bowl, open at both ends, pivoted rearwardly on the frame, and having a dig ing edge at its front end; ground supports for the frame; means to rotate the bowl about its pivot, from carrying position, in one direction to dig and in the other direction to dump; and means controlled by the angular position of. the bowl, whereby the pivot of the bowl will be lower in digging position than in carrying and dumping positions; said last named means consisting in a cam carried by the bowl, and a bell-crank, one arm of which is supported by the ground support, the other end of which bears upon the cam-surface of the cam, and the elbow of which is joumaled in the frame.

4. A scraper according to claim 2, characterized by the fact that the variable support is a bell crank.

5. In a scraper, the combination of: a ground support; a main framepadirt digging and'dirt carrying bowlyp'ivota'lly,supportedby the main frame, having a digging edge at one end; means to rotate the bowl about its pivot; a frame supporting connection between the bowl, the main frame, and the ground support, such that the rotating of the bowl about its pivot will cause the connection to positively raise and to lower the main frame, to raise and to lower the pivot in such a manner that the pivot will be higher when the bowl is rotated into carrying position, and will be lower when the bowl is rotated into digging position.

6. A scraper according to claim 5, characterized by the fact that the frame supporting connection between the bowl, the main frame, and the ground support, is capable of rotation about its connection with the ground support, and performs its function by rotating about its connection to the ground support.

7. In a scraper, the combination of: a ground support; a main frame; a rocking element to support the main fram on the ground support; a pivot on the main frv me; a dirt digging bowl, having a digging edge at one end, and pivoted on said pivot; means to rotate the bowl about its pivot into dig ing position; the position of the rocking element relative to the other elements being controlled by the angular position of the bowl, whereby the main frame, and thereby the pivot of the bowl, will be lowered when the bowl is rotated into digging position, and will be positively raised by the rocking element when the bowl is rotated into carrying position.

THOMAS R. PAULSEN. 

